package com.kejizhentan.springboot2thymeleaf.interceptor;


import lombok.extern.slf4j.Slf4j;
import org.springframework.web.servlet.HandlerInterceptor;
import org.springframework.web.servlet.ModelAndView;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;

/**
 * @Auther: kejizhentan
 * @Date 2022/4/18 20:24
 * @Description:
 * 登录检查
 *      1、配置好拦截器要拦截哪些请求
 *      2、把这些配置放在容器中
 */
//@Slf4j
public class LoginInterceptor  implements HandlerInterceptor {
    /**
     * @descrition:目标方法执行之前
     * @auther: kejizhentan
     * @date: 2022/4/18 20:23
     */
    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
        //log.info("preHandle执行{}",handler);
        //通过日志工具@Slf4j打印所有被拦截的路径
        String requestURI = request.getRequestURI();
        //log.info("preHandle拦截的请求路径是{}",requestURI);

        //登录检查逻辑 
        HttpSession session = request.getSession();
        Object loginUser = session.getAttribute("loginUser");
        if(loginUser != null){
            //放行
            return true;
        }
        //拦截住。未登录。跳转到登录页
        request.setAttribute("msg","请先登录");
        request.getRequestDispatcher("/").forward(request,response);
        return false;
    }

    /**
     * @descrition：目标方法执行完成之后
     * @auther: kejizhentan
     * @date: 2022/4/18 20:23
     */
    @Override
    public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler, ModelAndView modelAndView) throws Exception {
        //log.info("postHandle执行{}",modelAndView);
    }

    /**
     * @descrition：页面渲染之后
     * @auther: kejizhentan
     * @date: 2022/4/18 20:23
     */
    @Override
    public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex) throws Exception {
        //log.info("afterCompletion执行异常{}",ex);
    }
}
